[Mike P.]

If memory serves me, light canon was anything over 2500 lumens. But then again it depends on whose definition. Low lumen was any projector that needed total light control while viewing.

 

[Mike P.]

And also how it's measured. There was a focus on using the ANSI Lumens 9 panel average. They even tweaked the numbers a bit by having the projected full white field the same color temperature as the bulb, 6500k I believe. It's been a few years since I was involved at Lumenlab, but I think a lot projectors measured 200 - 300 lumens. A few of the better ones were up around 400. And all with a $19 e-Bay light meter. I think I still have mine. Blackout cloth was the screen of choice.